21454454163 has 16 divisors (see below), whose sum is σ = 28734797952. Its totient is φ = 14238600000.

The previous prime is 21454454159. The next prime is 21454454167. The reversal of 21454454163 is 36145445412.

It is an interprime number because it is at equal distance from previous prime (21454454159) and next prime (21454454167).

It is not a de Polignac number, because 21454454163 - 2² = 21454454159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21454454167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1711348 + ... + 1723838.

It is an arithmetic number, because the mean of its divisors is an integer number (1795924872).

Almost surely, 2^21454454163 is an apocalyptic number.

21454454163 is a deficient number, since it is larger than the sum of its proper divisors (7280343789).

21454454163 is a wasteful number, since it uses less digits than its factorization.

21454454163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15026.

The product of its digits is 230400, while the sum is 39.

Adding to 21454454163 its reverse (36145445412), we get a palindrome (57599899575).

The spelling of 21454454163 in words is "twenty-one billion, four hundred fifty-four million, four hundred fifty-four thousand, one hundred sixty-three".